Early in the final episode of The Good Place Chidi is leading a philosophy discussion and a disagreement emerges on the interpretation of a particular sentence in a book by the philosopher Todd May.
Chidi quotes the sentence as "mortality offers meaning to our lives" but an audience member chips in saying that the sentence actually reads "mortality offers meaning to the events of our lives". Eleanor responds that Chidi should know what he is talking about as he has been teaching philosophy for aeons. The audience member disagrees saying he wrote the sentence.
The audience member is Todd May (ie not an actor playing Todd May).
Are there any other examples where real people playing themselves appear in the show?